Vegetables GardeningGrow Amaranth Harvesting A 10ft Tall Amaranth – WOW!! Ancient Heirlooms, How To Harvest Amaranth!!! By Sumit - November 2, 2013 0 47927 Share on Facebook Tweet on Twitter How to harvest seeds from a giant 10ft tall amaranth and a little bit of garden clean up. Amaranth is a miracle food!!! 4.00 avg. rating (67% score) - 1 vote